DRIFT POTENTIAL FOR LOW PRESSURE EXTERNAL MIXING TWIN FLUID NOZZLES BASED ON WIND TUNNEL MEASURMENTS

Document Type : Original Article

Authors

1 Assis. Prof. in Agric. Eng. Dept., Fac, of Agriculture, Kafrelsheikh Univ., Egypt

2 Federal Biological Research Centre for Agriculture and Forestry Braunschweig, Application Techniques Division, Messeweg 11/12, D-38104 Braunschweig, Germany

Abstract

Wind tunnel tests provide one way in which the risk of drift from given nozzle conditions can be quantified but it is accepted that the use of field measurements and modeling approaches are also valid for determining a relative for Ex. Mix. Twin Fluid drift risk factor. The goals of present study assess the drift potential of the EMTF nozzles using wind tunnel tests, by comparing the drift profiles of sprays from EMTF nozzles those from standard fan nozzles.. As well as investigating to find the optimum combination for EMTF nozzles from the available nozzles in the marketing which may be producing the low drift. The current investigation research was carried out in the Federal Biological Research Centre for Agriculture and Forestry (JKI), Braunschweig, Germany. The wind tunnel was adapted at the optimum air conditions, 20° C air temperature and 80 % relative humidity. Eight drift-reducing external mixing twin fluid nozzles were evaluated in a wind tunnel to compare drift. Each tip was compared at 60 and 100 kPa liquid pressures, parallel to a 1, 2 and 3 m s-1 wind speeds, and at the 150 kPa air pressure for each.
The results indicated that the external mixing twin fluid nozzles may be producing the low drift at low liquid pressure. The increase of liquid pressure tends to decrease the vertical drift and increase the DIX values. The optimum co-angling for EMTF nozzles was found at 45° that may reduce the drift potential and fallout of spray for all treatment conditions. The N5 (Lechler FT 5–608 & XR110ß03 VK) nozzle may be able to reduce the low fallout airborne volume flux compared to Standard ISO nozzle and N1 nozzle which produced at 43.7 % DIX value. The DIX values at 100 kPa liquid pressures, co-angling 45°
and wind speed 1 m s-1 were 291.5% for N5  (Lechler FT 5-608 & XR110-03 VK) nozzle and 29.6 % for the N1  (Lechler FT 5-608 & TT110-03 POM) nozzle respectively. As well as the vertical drift for the above mentioned conditions were 1.5 %, 1.6 %, 1.3 % and 1.2 % for the EMTF nozzles N2, N3, N4 and N5 respectively The airborne values for N5 (Lechler FT 5–608 & XR110-03 VK) nozzle were 0.71 ml/s.mm , 0.07 and 0.046 ml/s.mm at ground level (zero mm) , 500 mm  and 600 mm height respectively.

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References

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Misr Journal of Agricultural Engineering
Volume 27, Issue 2
April 2010
Pages 438-464

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